Mixing machine



Nov. 20, 1951 Filed Jan. 20, 1950 FVG. l.

MIXING MACHINE 3 Sheets-Sheet l' v 1N VENTOR ./4/1455 ,4. 04u/s,

-mlmwzf/{Wm ATTORNEYS Nqv.. 20, 1951 A. DAvxS MIXING MACHINE 3 Sheets-Sheet 2 Filed Jan 20, 1950 I \|l.'. Il

INVENTOR A. @Al/As,

ATTORNEYS Nov. 20, 1951 Filed Jan. 20, 1950 J. A. DAVIS MIXING MACHINE s sheets-Sheet s ATTORNEYJ aviar,

and

Patented Nov. 20, 1951 QFFlCE MIXING MACHINE James A. Davis, Topeka, 33315 Signor to mv.Economy Building Block N [achineH Cm Inc 10Pka"KaI S-, 3f QQiD'Mationf .Kansas Application J anuary 20, 1950, Serill. No- 133,566. I

01- ziafa),

4 Claimslnvention relates to a mixing machine. A primary object of the invention is to provide a machine for thoroughly mixing soil with cement any'desired proportions'. further irrl'pc rtant object is to provide a mixing machine includingrotary, spring loaded in eans for crushing c'ods of soil and kneading and@ mixing thecment into'the soil.

A further. object'is to provide a mixing machine 0i*` the"ablove`` mentioned character' including a stationary -druin and' rotating scraper means 'arlagd .Within the drum in`trailing relationV `with res' ect to .the mixingmeans, so' that the'soil and c will be SC alpifdfIOIIIY [thedruin after it is"k'n'ea de`d orl pressed together by the 'mixing' me Y "'rther object is to provide a soil and cement machine of the 'above-mentioned'cnaracti"`including` a conveyor fdr'introducing sqil into `a mixing vdrum in `an even and eentinu'o'u's manner, .the mixingdrum being' arranged so that the 's'ol and cement pass through the same'in' an even 4'and .continuqus manner under the' iniiuence 0f"gr.av` ity and are discharged from fone end of the .mixingfdrum afterthe mixing operation` is QQDDBd 1 I further Olucerit is to provide ,novel renting iuing'and `scraping mechanisn for -a' miA ma hin-eci the abovefrnentioned character.

A still further object of 'the invention is to provide a mixing machine of' the abovementienedcharacterwiii'ch is highly simpli'ed; compact .and extremely s tur'ciy andv durable, yet "re'laf-k i@ ely 'iight weight in ebnen-neuen:

' Othrobjects andadvantages'of the invention v5/ ill be''aig'rpa'rent"di'irifng'l the courseof the "folng descripi'icin.A` A "I'n'the accompanying drawings forming a part 'of this application, and in 'which like numerals ae employed-t0 qestgpaff .11158 ,parts throughoud 40 Vof the'legs` ,l ,l,andthejplatesand 22 are Itightly flge'mf 'Figure 1 is a side elevational View of a lmixing 'ine 'embdl'g the invention', parts bIOkn `""'igure2is an end elevational view of the inahine', parts 'broken`avvay;

Figur'e 3"is a transverse, substantially vertical sectional l-vievv` vtaken on line 3-'3` of A:Figure 1;

" Figure .4 is a central, vertical, longitudinal sectional View takenon line 4'-l4 of Figure 2.

Inthe drawings, ,ii/here, for the' purpose of illustration, is shown a'preferred embodiment of thinvention, the numeral l0 designatesgenervally astand or supportjforltne machin-e including pairsofupstanding, vertical 'postsor legs H 5 6 I .ji i liiinngnedly eonneuteg vwill ,s lgle sides with d iametrically oppositely arranged',1 a

5 secured in thel selected' adjusted po 2 and I2 rigidly connected at their bottoms py' means of pairs of "horizontal, longitudinallvaifd transverse members or rails i3 and lli.V The to s of the pairs or legs" Il and I2 arev preferably d posed at substantially the same elevation.l Al'rangedfadiecent tothe tops 0f' the pairs Qf. legst Hj and I2 and' between the pairs cf. legsjfs, an elongated, "lpilgifudinally extending; Sleht yi inclined Ls122513.fm'fdfy illg d11ll`01T`Shll which is cylindrical, andWhichihcludesatli L' staming end plates l5 and l'1 fi I itegfally'l ed nectedi'with the crlrldlticaljede wall ,121i bf tri drum: Near and longitudinally" inwardly ene. of the anim which is disposed attnefnighe'st elevation, the drum' is* provided upfo" opp vertical jchannel sections r plates T9 rigidly seiJ cured t9 the periphery-fof the brfweidig or the'like. These plates (I9 'are disposed'vadja cent to"th e inneijffaces 'of the legsl [Zand dj cent to the tops of such' legs and arrangedfii sliding contact with thfe'legsv I2. The plates '[9 are p ivotally onnetedwith the legs 41 2A byneai'i's oi suitable pivot pins or bolts" 2Q exterfid g trirpue'hapertures formesifin the 0f :fh "le l2' and inY the plates I9; The"L upperiol gh'ti' hand end, o f the drum, Figures 1 and 4?..1 thi pivgtallr .mounted 111.509 "theliOP'S Qf' th lg's.. l2, S 0 that the g drurn I5 lI nay have its inclination or siepe adjusted'by Swinging ,it upon tllpl 5.0.1.@ 2.0 AI adolalflpif 0f d'xmetfclnfl* bdsitely arranged,verticel'pleis'bf harlel" f tions V2,! arelrigidly secured itoV the' opposite lsides 0f .the imm '.5' meer. tslqpposite, 0r' loweref" a .the Blattes 2'! "arearrfeged @@J'a'eilt t the ne facesfof'fthe pair of legs ll and in `sliding tact therewith." A pair of detachable clamp pl s or channelsections 22 is provided adjacent yto the plaies 2l .and ,disposed upon'ihe etici-iside@ 'menipuianngtnepolts z3.

The .Stationary 'mixing drum, t5 is prqyiied in its bottom and adjacent to the end yplatelli With alarge'disha'ige Opening 2li.v The fis@ .ther prv'ded .initSiQp and adjartgih@ P- `pbsite enii plate' ,u vwith an inlet' qpenin s surrounded by ashort, upstanding', tubular s po t or sleevefZ integrally connected vvith cfv the drum. AlargeI top section '2.1 ""Qfjthe ali` of the drum by means of a longitudinally extending hinge 28 which is spaced transversely upon one side of the longitudinal center line of the drum. The hinge 28 and top section 21 preferably extends for the entire length of the drum I and the section 21 constitutes an upwardly swingable, widecover for theV top of thedrum, which may be opened to aordfy access to the interior of the drum. The top section or cover 21 preferably extends circumferentially about approximately one-quarter of the circumference of the drum, and the longitudinal edge 29 of the cover remote from the hinge 28 is preferably disposed near the vertical center of fthe dr'urri.,V The topf section or cover 21 has apertured-lugs Y3Il rigidlyv secured to it, by welding orwthe'likeuand companion apertured lugs 3I are suitablyrigidly-se-V- cured to the side wall I 8 below the lugs 30.V

Detachable bolts 32 are provided for detachably connecting the lugs 30.and 3i together, so that the cover` 21` may be held' rmly closed.

. II'Ihe .end plates l I6 'and I1 of 'the drumare provided vwith axially aligned openings '33 and 34 for freely` rotatably receiving a central, longitudinally extending drive shaft` 35 which extends for the entire lengthof the `drum I5 and axially outwardly of the end plates I6 and I1, as shown. The 'opposite ends of the" drivefshaft 35 lare journaled in suitableLbea'ring's 36 and `31 rigidly secured-to theouter facesf'of the 'end plates I6 and I1 and arranged ,in axial" alignment. Inwardly of the bearing-36 5T suitable packing ring or seal 38 lisfprovided for sealing the opening 33 which is at'the lowermostend ofthe drum. The end of the drive-shaft 35 adjacent to the bearing 31- Vis provided. with an integral, reduced, square extension .39 upon which is securely mounted for -rotation with` the -drive shaft a sprocket member org'hub 4D .carrying inner and outer sprocket-wheels .4I and V42 isH securely mountedupon the square extension 3S for rotation with the` driveshaft 35. The outer sprocket wheel=42 is-preferably largerv than the L inner sprocket: Wheel 4I, as shown. Both sprocket wheels are disposed close to theV adjacent end plate I1 of the drum. e a

-Rigidly mounted upon the drive shaft 35 within the drum I5 in any suitablemanner, such as by welding, is an elongated housing such as a tube or sleeve 43 which is rectangular in transversecrosssection, Figure 3, and this sleeve Vextends for substantially theentire length of the drive shaft between the end plates I 6 and I1. The tube or sleeve 43 rotates with the drive shaft and cannot move relative thereto. The sleeve or tube 43 includes opposed pairs of parallel, flat sides 44 and 45 which are arranged at right angles, Figure 3. l

Pairs of longitudinally spaced, arcuate spring arms or supports 46 are disposed within the drum I5 and extend generally circumferentially therein. The spring arms 46 surround the tube 43 and are spaced radially therefrom and between the sleeve 43 and side wall I8 ofthe drum. The inner ends of'thefspllng arms 46 are bent to `provide generally radial, straight extensions or arms 41 bolted or otherwise rigidly secured toV the adiacent'flatsides 44 or r45.r The free ends of the spring arms 46 which have their extensions secured to the pair of sides 45 are Adiametrically oppositely disposed, and the free ends of the springarms A46 which have their extensions secured to the sides 44V are diametrilcally oppositely. disposed, Figure 3. The spring arms 46 secured to the sides 45 of the tube 43 4 thus have their free ends spaced circumferentially 90 from the free ends of the spring arms 46 which are secured to the sides 44. The spring arms 45 are spring biased radially outwardly toward the side wall I8 of the drum I5. The spring arms 46 are preferably formed from heavy spring ysteel orthe like, ,and the arms z are quite stiff and exert a substantial. force radially outwardly. The arrangement is such that the straight extensions 41 of the spring arms which are secured to the sides 45 are parallel and arranged at right angles to the extensions 41 ofthespring arms which are secured to the sides 44;',Arrangedbetween the free ends of each pair the particular scraper blade.

otspring arms 46' is a large, cylindrical roller or wheel 48 having a hard, solid rubber tire 48: mounted thereon. Each roller 48 is freely rotatably-.mounted upon a short shaft or axle 5l) having its opposite ends rigidly mounted within rings orloops5l integrally formedupon the free ends ofthe pairsLof springarms 46;' The rubber tired rollers 48 are thus; bodily carried by the spring arms 46 andresilientlyurged by the spring siderable force.

turnY with it, and the rollers revolve upon their shafts 5I) and roll over the inner surface of the drum I5. As clearly shownin ligure 4, the circumferential and longitudinal spacing of the rollers 48 is such thatsubstantially the entire inner surface of the stationary drum I5 is traversed by the rollers when the driveshaft 35 rotates. The rollers 48 need not be rubber tired, and if desired, the rollers may?, be formed of metal, or any other suitable material.

Y Pairs of straight, substantially radial/rigid' arms or bars 52 areV arranged in laterally spaced relation between each pair of spring arms v46, andthe inner ends of the rigid arms 52 arebolted' or otherwise rigidly secured to the adjacent flat sides 44 or 45 of the rectangular sleeve 43. The outer ends of the arms .52 terminate near the inwardly of the side wall I8, as shown. The arms 52 which are secured to the sides 45 are parallel and arranged at right anglesrto the arms which are secured to the sides 44. Each pair of arms 52 between each adjacent pair of spring arms 46 is secured to the same side 44 or 45 of the tube 43. All of the arms 52 arev preferably slotted adjacent to their inner ends, so that the arms may be adjusted radially with respect to the side wall I8. All of the arms 52 are bent near their outer or free ends for forming short, inclined extensions or portions 53 which extend substantially truly radially with respect to the side wall E8. Elongated, straight scraper blades 54 are bolted or otherwise rigidly secured to the extensions 53, as shown, and the outer, longitudinal edges of the scraper blades are disposed in sliding contact with the inner surface of the side wall of the drum I5. The scraper blades 54 extend longitudinally or axially'of the drum. The lengtlrof the scraper blades 54 4are preferably equal tothe axial length of the rollers 48, so that the scraper blades will scrape the` same area or'segment of the drum traversed by the roller 4B adjacent to The arrangement is such that the scraper blades 54 carried by the arms 52 which are secured to the sides 45 follow or trail behind the rollers 48 carried by the spring armsY 46 which are also secured to the *sides -flldgorigure ,-3.. Accordingly, .the scraper bladescarried :by thearms 5 2 which aresecured to theesides All trail. behindfthe r roller-sld 8, `Which arercarried '.by the. springarms 4 6. secured to the.

sides 44. Each scraper b lade ,54 is accordingly spaced. circumferentially substantially 90 .from

the..roller 48v which it follows, and Asuch .scraper the machine, so that the inclined radial extensions 53 andscraper .blades .5.4 project forwardly With respectl to the path of travel of the rotary mechanism within .the stationary. drum I B.

jaen elongated, longitudinally extending .oon-

veyor 55 @extends adjacent ,to the t op-..of themixf ing-.drum ,l5 for theentire vl eng th.;0 f the drum and slightly beyond the end plate J6, thereoi This conveyordcomprisesan elongated trough o'r .`.c.asing.5l3 which is substantially .U-.Shapedin transverse crosssection andopen atitS tQp. The trough .55 includes upstanding ends .51 and 5 8 hallinfglbearings tor sleeel/Zes 58 and ...6.0 rigidly mounted upon their outer faces by welding or the like, and the bearings 5 9 and 60 are arranged in axial alignment. The troughSissupf ported .near its opposite ends .and adjacent to the vopposite ends of the drum l5 by means of pairs. of legsl .and 62, suitablyrigdly secured thereto. The legs 26| .and 62 extend below the bottomlof the trough, as shown, .anddiverge below thebottom of the vtroughfor. straddling the. top` of V.thecylindrical drum l5. The. bottom vends of the legs 6l arefreely disposed, Vand terminate adjacent to, ythe outer side vof the hinge 2 8, as shown. A narrow, radiallyprojecting strip or plate 5.3 -is rigidly securedlto the periphery of the sidewall. la near and. circiimferentially Vspaced slightly from vthe hinge 28, and. this strp or plate extendslongitudinally for the entire length of the drum l 5. The bottoms., of thelegs 6 I restfreely upon the `side .wall ISoof the drum, .and Aalso .en gage against the .strip or plate 63 which .serves as a .stop or holder .which prevents lthe legs .,El from :sliding downwardly over the periphery .of theorem. i5. .Thelegsz ,atytheopposite,side of thetrough 5.6, have their bottom ends .dettohably connected Withradiallyprojecting aperturedlugs M suitably rigidlyrsecured to the cover 21; by means of..b.olts 575 or the like. The .arrangement isfsuch that when it is desired v.to raise `the ,cover 21, .theconveyor 55 mayv bebodily removedrfrom theldrum ,l5 .by merely removing .the b olts.

TheJegs-.land 6.2 maintain the bottom ofthe trough 55. spaced radially slightlyabove the top ofthe drum l5, Figure. 3. The .trough 56 iS;Dr o vided in its bottom and adjacent-to the-.end y53 with adischarge opening'li surrounded `by .a short, 'depending-spoutvor sleeve .61 integrally secured tothe trough andextending into .the spout 25, as vshown. Freelyxotatably mounted within .the U-shaped trough f5.6 1 and nexten. 'ng for y3 substantially Vthef entire length thereof is ya olew :type conveyor element -or auger 58 inplooi-nga radially-projecting espiral vane .-69 a;in

tegrallyseCured thereto. Atits opposite-ends, the auger 1&8 isprovided Withrreduoedfaxle eli: .tensions wenn 'l I journaledwithinthe'fbearines .Saand 60. :Theraxleextension fl I; oroiootsraxially beyondzthebearinga @e :and hasrigidl-yfsecured vto lit for :rotation therewith fa rsprocket .wheel 1:2-:disposedin lateral alignmentwith theinner sprocket wheel l. ;Asprocket chainl-S; istrained .over the sprocket wheels A I :and 1 2. zasrshovvn.

YIA.substantially.horizorltolnotorfstaodl .f. .r.fplatvA f forni. M sfsuitablyrigidly.mounted upon'tlielside of.v the vStatiollarv drum l5 adjacent to thais-'ge 6,2.4 This platforrn-v 14 is disposed adjacent to ther form 14 is .arranged at, an elevation. somewhat below thev .driveshaft 3 5.v .A sutablegasoline enginev 'l5 .or thelike Vis rigidly mounted Vupon th.e .p1a tfor m 14, tand this engine Vinoludesa .row

Wheell 191s substantallvfsmallerthan the Sprocket, wheel 142.- A second-.sprocket chain 8.0 is trained; over the sprocket Wheels 1 9 and:42 and extends- 'substantially-all lCgditangles to the s.procketfcliainK 13y lFiguren YA longitudinally extending, horizontal AVplat-.- form 8| may be provided,-and-;suitably rigidly mounted u-ponlthelegs ll. This platformis preferablvdisposed Substantially atthe elevation of the bottoni of the drum l5', so that a workerginay stand upon itwhen the cover -2'l iS.QD.eI1S;f.Q1? gaining access `to the interior of .ther drum l5. A workerstanding upon the platforml /rriay-also. View the: inside of; the trough 51S.

The operation of the mixing machine is fas follows:

The engine l5 -may befsrtarted forimparting rotation to the sprocket wheelllwhich, through the sprocket chain .865, will drive Athe `sprocket wheeljdlin turn driving the shaft clockwise, Figure 3. When this occurs,thesprocket chain: 13 will be driven bythe sprocket Wheel 4l for driving the upper sprocketwheel 72, which in turn will Vimpart rotation-to the-augerfor oonveyorscrew-68- vThe auger .8 ,Will also rotate QlQ QkWlee, -Figure-3. vVi/"ithvthe drive shaft 35fthusrotating clockwise :Figure ,3, the l.willens 4,55 .and s crapenbladcs 5 4 will likewise travel clockwise aboutthe v interior of,- thef stationary drum lifes..

With the mixing machine thus in operation the @properly proportioned amounts .of soil :and cemenaarelintroduoediinto the .leftrhand end-rofthe trough'i, Figure .Ligand the -augerl will miga;l and "convey thesengredients toward theurightf hand endofthe-trough 56,1where theingredients may idischarge :through the. opening 66 and into thel top of @the -mixing'drum l5. It should :be mentionedgthat the letf'han'd or lower end-or the mixing -drumis previously vertically adjustedby means ofithe bolts, 123; and associated elements, to produce the desired inclinationof` the drum. I5so that the. ingredients .Willgravitate toward the discharge: openingr24 during the, mixing operation.

.The mixture of soil ancll cement-will thusiflow into the Ymixing y drum 5 t5 through the discharge opening 66 yin fa `continuous and even stream. Oncewithin the. drum l5,.`the ingredients, willghe acted upon by the mixingrrollersfid vwhich--are constantly rotating and rolling over the finner surface of the drum l5, as previously.described. The mixture `of vsoil .and cement passes beneath the'lfiard rubber tires :of the rollers 4dandthe rollers thoroughly knead-and vmix-togetherthe soil and cement, while'crushing any large -clods of .soi1.whch:may^be present. Whenethezsoil is introduced .into the .trough 5:6, :it may contain gravel .or other hard substances -wboh Awill he feditogetherwith the .soiland cement. fintofthe drum l5. :When this :gravel .or 'hard Substance PlSSQS beneath the rollers nlll?, such rollers may surface of the drum I after the rollers have thoroughly mixed and"` vkneaded the mixture against'the side Walls of the drum. As"`this mixng and` scraping operation continuesfthe ingredients within the drum l5 gradually gravitate toward the end plate I6, and eventually discharge through the opening 24`in a continuous and even4 streamlV A sufrcientvnumber of the rollers and scrapersare provided Within the drum l5 to thoroughlyn mix the ingredients togethenand in this connectionitshould be understood that any desiredY number of the rollers and scrapersmay be provided, and I do not Wish to limit the in' vention to the precise number of Scrapers rollers shown in the drawings.

1A conventional type hammer mill or pulverizing machine, not shown, may be arranged beneath the discharge opening 24 for receiving the mixed soil and cement together with any gravel which may be present, as these ingredients pass through the discharge opening 24. The hammer mill or pulverizer will thoroughly pulverize the mixture which is discharged from the mixing machine, so that the resultant product Will be ready for use in making building blocks or the like. The hammer mill need not completely pulverize the mixture discharged from the opening 24. Its use is mainly to break up cakes or clods of the mixture formed by the rollers 48, so that mixed material will be better adapted to be measured for forming building blocks of uniform weight and size.

The rate of travel of the ingredients through the drum l' may be varied by raising and lowering the left-hand end of the drum, Figure 4, as previously stated. By thus increasing the rate of flow or travel of the ingredients through the mixing drum l5, the number of times which the ingredients will pass beneath the rollers 48 Will also be varied.

f Obviously, the mixing machine may be employed for mixing various types of ingredients, and I do not Wish to limit the invention to its use for mixing soil and cement only. If desired, the-entire machine may be mounted upon a suitable trailer ior mobility. The construction of the machine is highly simplied, compact and extremely sturdy. Due to the rollingY action of the rollers 48, and the' absence of any hammering or impact' producing elements, the machine will have an extremely long life in use.

'It is to be understood that the form of the invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in shape, size and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope ofthe subjoined claims. Having thus described myinventioml cla-im:

1. A mixing machine comprising a base, a closed drum arranged longitudinally or said base and ymounted on said base for movement from a horizontal position to a position at an angle with respect to theV horizontal, a longitudinally extending4 shaft positioned Within said drum and rotatably supported thereon, one end of saidshaft projecting out of said drum, a longitudinally extending housing circumposed about said shaft and ixedly secured thereto, a plurality of transversely disposed spring supportspostionedl in and - ports and staggered Vspacedrelation about and 'along sd housing and eachV having one Y'end secured to the` latter, a longitudinally Vdisposed roller rotatably: supported'in'the other end of each of said sup'j' I engageable `with the inner"surfacev'orJ said drum, the respective rollers being cfa le'rig'izhiy such thatthe rotative paths of travel of longi-' tudinallyladjacent rollers partially overlap each' otherpsaid drum being provided with an inlet fori the introduction of the material to be mixed and` an outlet for thedischarge of the mixed material@ and means operatively connected to thewprojectj` ing end of said shaft for eiecting rotation of said Shaft A f. 2. AV mixing machine comprising a base, a closed vdrum arranged longitudinally of lsaiclvbalseV andmounted on said lbase/for movement from a. horizontal position to a position at an angle witl'lL respect to thehorizontal, a longitudinally ex-Q tending shaft positioned within said drum and` rotatably supported thereon, one end of said shaft projecting out of said drum, a longitudinally. extending housing circumposed about said shaft. and xedly secured thereto, a plurality of ,transl-, versely disposed spring supports positioned in staggered spaced relation about and along said housing and each having one end secured to the latter, a longitudinally disposed roller rotatably supported in the other end of each of said supports and engageable with the inner surface of. said drum, the respective rollers being of a length'. such that the rotative paths of travel of longi-A tudinally adjacent rollers partially overlap each other, each of the spring supports embodying a pair of leaf springs arranged in parallel spaced` relation and each having one end xedly secured to the housing, a longitudinally disposed roller rotatably supported in the other end of each of said pairs of leaf springs, said drum being provided With an inlet for the introduction of the; material to be mixed and an outlet for the dise4 charge of the mixed material, and means opera--v tively connected to the projecting end of said shaft for effecting rotation of said shaft. ,Y 3. A mixing machine comprising a base, a closed drum arranged longitudinally of said base and mounted on said base for movement from a horizontal position to a position at an angle with respect to the horizontal, a longitudinally ex?. tending shaftl positioned Within said drum and rotatably supported thereon, one end of said shaft projecting out of said drum, a longitudinally extending housing circumposed about said shaft and nxedly secured thereto, a plurality of transA versely disposed spring supports positioned in staggered spaced relation about and along said housing and each having one end secured to the latter, a longitudinally disposed roller rotatably supported in the other end of each of saidsup-vr ports and engageable with the inner surface'of said drum, the respective rollers being of a length such that vthe rotative paths of travel of longitudinally' adjacent rollers partially overlap each other, a'plurality of transversely disposed scrape'rs positioned exteriorly of and carried by said housing' and each engageable'with the inner face of "said drum, saidy Scrapers being arranged -so that a scraper is in back of and spaced from one of the adjacent rollers, said drum being provided with ran inlet for the introduction of the material to' be vmixed and an outlet for the discharge of the mixed material', and means operatively connected to the projecting end of said shaft for effecting rotationof said shaft.

-4.1.A;mixing. machine comprisingv a bascg-.a

9 closed drum arranged longitudinally of said base and mounted on said base for movement from a horizontal position to a position at an angle with respect to the horizontal, a longitudinally extending shaft positioned Within said drum and rotatably supported thereon, one end of said shaft projecting out of said drum, a longitudinally extending housing circumposed about said shaft and xedly secured thereto, a plurality of transversely disposed spring supports positioned in staggered spaced relation about and along said housing and each having one end secured to the latter, a longitudinally disposed roller rotatably supported in the other end of each of said supports and engageable with the inner surface of said drum, the respective rollers being oiga length such that the rotative paths of travel 'of longitudinally adjacent rollers partially overlap each other, each of the spring supports embodying a pair of leaf springs arranged in parallel spaced relation and each having one end xedly secured to the housing, a longitudinally disposed roller rotatably supported in the other end of each of said pairs of leaf springs, a plurality of transversely disposed Scrapers positioned exteriorly of and carried by said housing and each engageable with the inner face of said drum, said Scrapers being arranged so that afscraper is in back of and spaced from one of the adjacent rollers, said drum being provided with an inlet for the introduction of the material to be mixed and an outlet for the discharge of the mixed material, and means operatively connected to the projecting end of said shaft for eifecting rotation of said shaft.

JAMES A. DAVIS.

REFERENCES CITED The following referenoesrare of record in the rile of this patent:

UNITED STATES PATENTS Number Name Date 940,552 Peterson Nov. 16, 1909 1,426,118 Sonsthagen Aug. 15, 1922 1,495,841 Guery May 27, 1924 1,959,712 Flowers May 22, 1934 2,117,175 Kaster May 10, 1938 2,237,787 Marshall Apr. 8, 1941 2,306,422 Beardsley et al Dec. 29, 1942 FOREIGN PATENTS Number Country Date 325,089 Germany Sept. 9, 1920 

